/*
 * Created on Jun 4, 2008
 * Created by Paul Gardner
 * 
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package org.gudy.azureus2.core3.util;

import org.gudy.azureus2.core3.security.SESecurityManager;

public class TimeLimitedTask {
    private String name;
    private int max_millis;
    private int priority;
    private task t;

    public TimeLimitedTask(String _name, int _max_millis, int _priority, task _t) {
        name = _name;
        max_millis = _max_millis;
        priority = _priority;
        t = _t;
    }

    public Object run()

    throws Throwable {
        final Object[] result = { null };

        final AESemaphore sem = new AESemaphore(name);

        final Thread thread = new Thread(name) {
            public void run() {
                try {
                    result[0] = t.run();

                } catch (Throwable e) {

                    result[0] = e;

                } finally {

                    t = null;

                    sem.releaseForever();
                }
            }
        };

        DelayedEvent ev = new DelayedEvent(name, max_millis, new AERunnable() {
            public void runSupport() {
                if (!sem.isReleasedForever()) {

                    SESecurityManager.stopThread(thread);
                }
            }
        });

        thread.setPriority(priority);

        thread.setDaemon(true);

        thread.start();

        sem.reserve();

        ev.cancel();

        if (result[0] instanceof Throwable) {

            throw ((Throwable) result[0]);
        }

        return (result[0]);
    }

    public interface task {
        public Object run()

        throws Exception;
    }
}
